package com.slfx.open.api.utils;

import org.apache.commons.codec.binary.Hex;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * @author zengqingfa
 * @className SHA256Utils
 * @description
 * @create 2022/9/27 18:56
 */
public class SHA256Utils {

    /**
     * 利用java原生的摘要实现SHA256加密
     *
     * @param str 加密后的报文
     * @return
     */
    public static String getSHA256StrJava(String str) {
        MessageDigest messageDigest;
        String encodeStr = "";
        try {
            messageDigest = MessageDigest.getInstance("SHA-256");
            messageDigest.update(str.getBytes("UTF-8"));
            encodeStr = byte2Hex(messageDigest.digest());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return encodeStr;
    }

    /**
     * 将byte转为16进制
     *
     * @param bytes
     * @return
     */
    private static String byte2Hex(byte[] bytes) {
        StringBuffer stringBuffer = new StringBuffer();
        String temp = null;
        for (int i = 0; i < bytes.length; i++) {
            temp = Integer.toHexString(bytes[i] & 0xFF);
            if (temp.length() == 1) {
                //1得到一位的进行补0操作
                stringBuffer.append("0");
            }
            stringBuffer.append(temp);
        }
        return stringBuffer.toString();
    }

    public static void main(String args[]) throws Exception {
        String str = "shenlongfeixian";
        System.out.println("原始：" + str);
        //e961dffd040490157690aa2ac18e174236e180d9910cde27d344593268cf5778
        System.out.println("SHA后：" + getSHA256StrJava(str));
        //使用apache common包中的类实现
        MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
        byte[] hash = messageDigest.digest(str.getBytes("UTF-8"));
        String s = Hex.encodeHexString(hash);
        //e961dffd040490157690aa2ac18e174236e180d9910cde27d344593268cf5778
        System.out.println("common包工具类：" + s);
    }
}